aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/pseries/eeh.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/platforms/pseries/eeh.c')
-rw-r--r--arch/powerpc/platforms/pseries/eeh.c115
1 files changed, 114 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c
index a06c91a4852..b760836bb9d 100644
--- a/arch/powerpc/platforms/pseries/eeh.c
+++ b/arch/powerpc/platforms/pseries/eeh.c
@@ -77,6 +77,9 @@
*/
#define EEH_MAX_FAILS 100000
+/* Misc forward declaraions */
+static void eeh_save_bars(struct pci_dev * pdev, struct pci_dn *pdn);
+
/* RTAS tokens */
static int ibm_set_eeh_option;
static int ibm_set_slot_reset;
@@ -366,6 +369,7 @@ static void pci_addr_cache_remove_device(struct pci_dev *dev)
*/
void __init pci_addr_cache_build(void)
{
+ struct device_node *dn;
struct pci_dev *dev = NULL;
if (!eeh_subsystem_enabled)
@@ -379,6 +383,10 @@ void __init pci_addr_cache_build(void)
continue;
}
pci_addr_cache_insert_device(dev);
+
+ /* Save the BAR's; firmware doesn't restore these after EEH reset */
+ dn = pci_device_to_OF_node(dev);
+ eeh_save_bars(dev, PCI_DN(dn));
}
#ifdef DEBUG
@@ -775,6 +783,108 @@ rtas_set_slot_reset(struct pci_dn *pdn)
}
}
+/* ------------------------------------------------------- */
+/** Save and restore of PCI BARs
+ *
+ * Although firmware will set up BARs during boot, it doesn't
+ * set up device BAR's after a device reset, although it will,
+ * if requested, set up bridge configuration. Thus, we need to
+ * configure the PCI devices ourselves.
+ */
+
+/**
+ * __restore_bars - Restore the Base Address Registers
+ * Loads the PCI configuration space base address registers,
+ * the expansion ROM base address, the latency timer, and etc.
+ * from the saved values in the device node.
+ */
+static inline void __restore_bars (struct pci_dn *pdn)
+{
+ int i;
+
+ if (NULL==pdn->phb) return;
+ for (i=4; i<10; i++) {
+ rtas_write_config(pdn, i*4, 4, pdn->config_space[i]);
+ }
+
+ /* 12 == Expansion ROM Address */
+ rtas_write_config(pdn, 12*4, 4, pdn->config_space[12]);
+
+#define BYTE_SWAP(OFF) (8*((OFF)/4)+3-(OFF))
+#define SAVED_BYTE(OFF) (((u8 *)(pdn->config_space))[BYTE_SWAP(OFF)])
+
+ rtas_write_config (pdn, PCI_CACHE_LINE_SIZE, 1,
+ SAVED_BYTE(PCI_CACHE_LINE_SIZE));
+
+ rtas_write_config (pdn, PCI_LATENCY_TIMER, 1,
+ SAVED_BYTE(PCI_LATENCY_TIMER));
+
+ /* max latency, min grant, interrupt pin and line */
+ rtas_write_config(pdn, 15*4, 4, pdn->config_space[15]);
+}
+
+/**
+ * eeh_restore_bars - restore the PCI config space info
+ *
+ * This routine performs a recursive walk to the children
+ * of this device as well.
+ */
+void eeh_restore_bars(struct pci_dn *pdn)
+{
+ struct device_node *dn;
+ if (!pdn)
+ return;
+
+ if (! pdn->eeh_is_bridge)
+ __restore_bars (pdn);
+
+ dn = pdn->node->child;
+ while (dn) {
+ eeh_restore_bars (PCI_DN(dn));
+ dn = dn->sibling;
+ }
+}
+
+/**
+ * eeh_save_bars - save device bars
+ *
+ * Save the values of the device bars. Unlike the restore
+ * routine, this routine is *not* recursive. This is because
+ * PCI devices are added individuallly; but, for the restore,
+ * an entire slot is reset at a time.
+ */
+static void eeh_save_bars(struct pci_dev * pdev, struct pci_dn *pdn)
+{
+ int i;
+
+ if (!pdev || !pdn )
+ return;
+
+ for (i = 0; i < 16; i++)
+ pci_read_config_dword(pdev, i * 4, &pdn->config_space[i]);
+
+ if (pdev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
+ pdn->eeh_is_bridge = 1;
+}
+
+void
+rtas_configure_bridge(struct pci_dn *pdn)
+{
+ int token = rtas_token ("ibm,configure-bridge");
+ int rc;
+
+ if (token == RTAS_UNKNOWN_SERVICE)
+ return;
+ rc = rtas_call(token,3,1, NULL,
+ pdn->eeh_config_addr,
+ BUID_HI(pdn->phb->buid),
+ BUID_LO(pdn->phb->buid));
+ if (rc) {
+ printk (KERN_WARNING "EEH: Unable to configure device bridge (%d) for %s\n",
+ rc, pdn->node->full_name);
+ }
+}
+
/* ------------------------------------------------------------- */
/* The code below deals with enabling EEH for devices during the
* early boot sequence. EEH must be enabled before any PCI probing
@@ -977,6 +1087,7 @@ EXPORT_SYMBOL_GPL(eeh_add_device_early);
void eeh_add_device_late(struct pci_dev *dev)
{
struct device_node *dn;
+ struct pci_dn *pdn;
if (!dev || !eeh_subsystem_enabled)
return;
@@ -987,9 +1098,11 @@ void eeh_add_device_late(struct pci_dev *dev)
pci_dev_get (dev);
dn = pci_device_to_OF_node(dev);
- PCI_DN(dn)->pcidev = dev;
+ pdn = PCI_DN(dn);
+ pdn->pcidev = dev;
pci_addr_cache_insert_device (dev);
+ eeh_save_bars(dev, pdn);
}
EXPORT_SYMBOL_GPL(eeh_add_device_late);